Steel tubing, etc arriving to start work. The Planetary Perch is to go on top of the little stairs hut sticking out. These stairs cabins are very common over here. They serve the dual purpose of providing access to the main flat concrete roof and there are normally water storage tanks for emergency use in case the mains supply is interrupted. We had 1600 gallons capacity installed up there. Got one 800 gallon tank removed to make room for the astro equipment.